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Add Diffie-Hellman Test to BigInteger Testcase.
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@ -265,4 +265,42 @@ abstract class Math_BigInteger_TestCase extends PhpseclibTestCase
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$this->assertSame('18446744073709551616', (string) $x);
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$this->assertSame('18446744073709551616', (string) $y);
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}
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public function testDiffieHellmanKeyAgreement()
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{
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// "Oakley Group 14" 2048-bit modular exponentiation group as used in
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// SSH2 diffie-hellman-group14-sha1
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$prime = $this->getInstance(
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'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1' .
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'29024E088A67CC74020BBEA63B139B22514A08798E3404DD' .
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'EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245' .
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'E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
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'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D' .
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'C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F' .
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'83655D23DCA3AD961C62F356208552BB9ED529077096966D' .
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'670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
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'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9' .
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'DE2BCBF6955817183995497CEA956AE515D2261898FA0510' .
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'15728E5A8AACAA68FFFFFFFFFFFFFFFF',
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16
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);
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$generator = $this->getInstance(2);
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$one = $this->getInstance(1);
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$max = $one->bitwise_leftShift(512)->subtract($one);
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$alicePrivate = $one->random($one, $max);
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$alicePublic = $generator->modPow($alicePrivate, $prime);
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$bobPrivate = $one->random($one, $max);
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$bobPublic = $generator->modPow($bobPrivate, $prime);
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$aliceShared = $bobPublic->modPow($alicePrivate, $prime);
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$bobShared = $alicePublic->modPow($bobPrivate, $prime);
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$this->assertTrue(
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$aliceShared->equals($bobShared),
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'Failed asserting that Alice and Bob share the same BigInteger.'
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);
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}
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}
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